Hi,Please help me understand what a Tunnel interface is because I'm confused with the tunnel source and tunnel destination.
interface Tunnel0
description Local GRE Tunnel Interface - Site A
ip address 172.16.3.22 255.255.255.252
ip tcp adjust-mss 1420
load-interval 30
keepalive 20 3
tunnel source 202.13.157.3
tunnel destination 14.160.7.164
What is the use of the tunnel source and destination? The Tunnel interface already has an IP address. From my understanding, the IP address of the local tunnel interface should be on the same subnet of the remote tunnel interface. Then what is the use of the tunnel source and destination? The tunnel source in this configuration is my fast ethernet IP address. I don't know what the tunnel destination is. Should this be the configuration on the other end?
Interface Tunnel 0
description Local GRE Tunnel Interface - Site B
ip address 172.16.3.21 255.255.255.252
ip tcp adjust-mss 1420
load-interval 30
keepalive 20 3
tunnel source 14.160.7.164
tunnel destination 202.13.157.3
So on my end (Site A) I need to have a route to 14.160.7.164 in order to establish the GRE tunnel?
Another one, what is difference of this configuration if I configure a site-to-site VPN?
Thank you very much.
